What do you mean "pull down on the knob. it should move 3mm (1/8") or so. then it will be very easy to turn.". how do you pull down on the knob?

The knob can lock in place to keep your setting. You simply pull the knob away from the valve to unlock it. Most users will install with the knob pointing down, hat is why they said pull down. Very good product, you will like it.

Can the oil supply cup be removed when oiling is not required for use with a plasma cutter?

No, it cannot, there. is air air pressure through the unit any time the supply is on. If you’re talking about just the oil cup, you could clean it out and and re-install to to use with a plasma cutter. Good luck!

Ok, so are you supposed to add water to this filter? I'm a little confused about how this is supposed to work.

No you are not supposed to add water. The clear part on the bottom of this regulator is to collect moisture in the air running through it. You then press the brass release on the bottom to drain any water that is collected.

Can I use it for my airbrush work, t shirts , hats etc?

It will take 125 psi air and dial it down to 0 psi. I needed 2 to 5 psi for my application. I would think it would work.

1 4npt Air Pressure Regulator With Gauge

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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¥4622

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡️ Control Your Air, Command Your Craft!

BUILT TO LAST - Steel bracket ensures gauge stability and long-term durability.
WIDE PRESSURE RANGE - Adjust from 0 to 145 PSI to suit every air tool need.
LEAK FREE CONFIDENCE - Engineered for almost zero air leakage, saving energy and costs.
PLUG PLAY SIMPLICITY - Quick installation and removal for hassle-free workflow.
PRECISION PRESSURE MASTERY - Maintain exact air pressure for flawless tool performance.

This compact Air Pressure Regulator with Gauge offers precise control over air pressure from 0 to 145 PSI, protected by a sturdy steel bracket to ensure stability and durability. Designed for easy installation with minimal leakage, it optimizes air tool performance and extends their lifespan, making it an essential upgrade for any professional or DIY enthusiast.

Specifications

ASIN	B07BRLXHHK
Best Sellers Rank	#156,555 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #503 in Air-Compressor Accessories
Date First Available	March 27, 2018
Is Discontinued By Manufacturer	No
Item Weight	7 ounces
Item model number	ZAT005
Manufacturer	ZHONG AN AIR TOOLS
Product Dimensions	1.57 x 3 x 2.95 inches

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